@peterleinchen - looking at that log, I'd rather say it is not modest to blame.
sending : H00007 LIST (SUBSCRIBED) "" * received: * LIST (\Subscribed) "/" INBOX received: H00007 OK LIST completed
modest sends one and the same request, but receives different responses. It is either the sent messages differ (which is not seen it the logs) or gmail returns different responses based on some unclear criteria.
sending : J00017 LIST (SUBSCRIBED) "" * received: * LIST (\Subscribed) "/" Drafts received: * LIST (\Subscribed) "/" INBOX received: * LIST (\Subscribed) "/" INBOX/Fold2 received: * LIST (\Subscribed) "/" Fold1 received: * LIST (\Subscribed) "/" Sent received: * LIST (\Subscribed) "/" TMO received: * LIST (\Subscribed) "/" TMO/PM received: * LIST (\Subscribed) "/" Trash received: J00017 OK LIST completed